diff --git a/db/migrate/20140626012511_modify_student_roles.rb b/db/migrate/20140626012511_modify_student_roles.rb
new file mode 100644
index 000000000..1db0a734b
--- /dev/null
+++ b/db/migrate/20140626012511_modify_student_roles.rb
@@ -0,0 +1,13 @@
+# -*coding:utf-8 -*-
+class ModifyStudentRoles < ActiveRecord::Migration
+  def change
+    # 修改学生权限
+    # 添加回复讨论区权限
+    role = Role.find_by_name('学生')
+    if role
+      role.permissions.append(:add_messages)
+      role.save
+    end
+  end
+
+end
diff --git a/db/schema.rb b/db/schema.rb
index 0032afedb..0d20d786d 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20140618155324) do
+ActiveRecord::Schema.define(:version => 20140626012511) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false